Answer:
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The largest country there is Saudi Arabia
For volcanoes to emerge oceanic and continental tectonic plate has to collide. Oceanic plate will subduct (sink), and will melt. Molten plate rises through crusts and forms volcanoes.
In Himalayas two sections of continental crust and create mountains (they don't subduct and melt).
Plains are the best spot to start a cattle ranch. There is abundant grass for the cattle and fertile soil.
Water in the deep ocean is more dense water than the surface layer. Naturally, more dense fluids and solids will be on the bottom and less dense fluids and solids will flow to the top.